Neutron gas scintillation imager with glass capillary plate

A glass capillary plate (CP) is one of the attractive candidates for a hole-type micropattern gaseous detector (MPGD). We have developed a neutron gas scintillation imager (n-GSI) that consists of a CPGD with a thin-layer neutron converter, a mirror, lens optics, an imaging intensifier unit, and CMOS camera system. To obtain the high spatial resolution, we investigated a new CPGD that the distance between the converter and the surface of the CP was set to close to 0μm. The performance of this neutron imager was investigated using neutron beams at beamline CN-3 of the Kyoto University Reactor. We successfully restricted the tracks of charged particles produced by the interaction between neutrons and 10B to within the hole of a capillary. The effective spatial resolution of the n-GSI was evaluated to be 80μm with the neutron image of the Gd test chart.